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MAN page from Trustix binutils-2.10.0.18-2tr.i586.rpm

objcopy

Section: GNU Development Tools (1)
Updated: 05 April 2000
Index

 

NAME

objcopy - copy and translate object files

 

SYNOPSIS

objcopy
[-F bfdname | --target=bfdname][-I bfdname | --input-target=bfdname][-O bfdname | --output-target=bfdname][-j sectionname | --only-section=sectionname][-R sectionname | --remove-section=sectionname][-S | --strip-all][-g | --strip-debug][--strip-unneeded][-K symbolname | --keep-symbol=symbolname][-N symbolname | --strip-symbol=symbolname][-L symbolname | --localize-symbol=symbolname][-W symbolname | --weaken-symbol=symbolname][-x | --discard-all][-X | --discard-locals][-b byte | --byte=byte][-i interleave | --interleave=interleave][-p | --preserve-dates][--debugging][--gap-fill=val][--pad-to=address][--set-start=val][--change-start=incr][--change-addresses=incr][--change-section-address section{=,+,-}val][--change-section-lma section{=,+,-}val][--change-section-vma section{=,+,-}val][--change-warnings][--no-change-warnings][--set-section-flags section=flags][--add-section sectionname=filename][--change-leading-char][--remove-leading-char][--redefine-sym old=new][--weaken][-v | --verbose][-V | --version][--help]infile[outfile]
 

DESCRIPTION

The GNU objcopyutility copies the contents of an object file to another. objcopy uses the GNU BFD Library to read and write the object files. It canwrite the destination object file in a format different from that ofthe source object file. The exact behavior of objcopyis controlled by command-line options.

objcopycreates temporary files to do its translations and deletes themafterward.objcopyuses BFD to do all its translation work; it knows about all theformats BFD knows about, and thus is able to recognize most formatswithout being told explicitly.

objcopycan be used to generate S-records by using an output target ofsrec(e.g., use-O srec).

objcopycan be used to generate a raw binary file by using an output target ofbinary(e.g., use-O binary).Whenobjcopygenerates a raw binary file, it will essentially produce a memory dumpof the contents of the input object file. All symbols and relocationinformation will be discarded. The memory dump will start at thevirtual address of the lowest section copied into the output file.

When generating an S-record or a raw binary file, it may be helpful touse-Sto remove sections containing debugging information. In some cases-Rwill be useful to remove sections which contain information which isnot needed by the binary file.

infileandoutfileare the source and output files respectively. If you do not specifyoutfile,objcopycreates a temporary file and destructively renames the result with thename of the input file.

 

OPTIONS

-I bfdname, --input-target=bfdname
Consider the source file's object format to be bfdname,rather than attempting to deduce it.
-O bfdname, --output-target=bfdname
Write the output file using the object format bfdname.
-F bfdname, --target=bfdname
Use bfdnameas the object format for both the input and the output file; i.e.simply transfer data from source to destination with no translation.
-j sectionname, --only-section=sectionname
Copy only the named section from the input file to the output file,discarding all other sections. This option may be given more thanonce. Note that using this option inappropriately may make the outputfile unusable.
-R sectionname, --remove-section=sectionname
Remove the named section from the file. This option may be given morethan once. Note that using this option inappropriately may make theoutput file unusable.
-S, --strip-all
Do not copy relocation and symbol information from the source file.
-g, --strip-debug
Do not copy debugging symbols from the source file.
--strip-unneeded
Strip all symbols that are not needed for relocation processing.
-K symbolname, --keep-symbol=symbolname
Copy only symbol symbolname from the source file. This optionmay be given more than once.
-N symbolname, --strip-symbol=symbolname
Do not copy symbol symbolname from the source file. This optionmay be given more than once.
-L symbolname, --localize-symbol=symbolname
Make symbol symbolname local to the file, so that it is notvisible externally. This option may be given more than once.
-W symbolname, --weaken-symbol=symbolname
Make symbol symbolname weak. This option may be given more than once.
-x, --discard-all
Do not copy non-global symbols from the source file.
-X, --discard-locals
Do not copy compiler-generated local symbols. (These usually startwith "L" or ".").
-b byte, --byte=byte
Keep only every byteth byte of the input file (header data isnot affected). byte can be in the range from 0 to theinterleave-1. This option is useful for creating files to programROMs. It is typically used with an srec output target.
-i interleave, --interleave=interleave
Only copy one out of every interleave bytes. Which one to copy isselected by the -b or --byte option. The default is 4.The interleave is ignored if neither -b nor --byte is given.
-p, --preserve-dates
Set the access and modification dates of the output file to be the sameas those of the input file.
--debugging
Convert debugging information, if possible. This is not the defaultbecause only certain debugging formats are supported, and theconversion process can be time consuming.
--gap-fill=val
Fill gaps between sections with val. This operation applies tothe load address (LMA) of the sections. It is done by increasingthe size of the section with the lower address, and filling in the extraspace created with val.
--pad-to=address
Pad the output file up to the load address address. This isdone by increasing the size of the last section. The extra space isfilled in with the value specified by --gap-fill (defaultzero).
--set-start=val
Set the start address of the new file to val. Not all objectfile formats support setting the start address.
--change-start=incr, --adjust-start=incr
Changes the start address by adding incr. Not all object fileformats support setting the start address.
--change-addresses=incr, --adjust-vma=incr
Changes the address of all sections, as well as the start address, byadding incr. Some object file formats do not permit sectionaddresses to be changed arbitrarily. Note that this does not relocatethe sections; if the program expects sections to be loaded at acertain address, and this option is used to change the sections suchthat they are loaded at a different address, the program may fail.
--change-section-address section{=,+,-}val, --adjust-section-vma section{=,+,-}val
Set or changes the VMA and LMA addresses of the named section.If = is used, the section address is set to val.Otherwise, val is added to or subtracted from the sectionaddress. See the comments under --change-addresses, above. Ifsection does not exist in the input file, a warning will beissued, unless --no-change-warnings is used.
--change-section-lma section{=,+,-}val
Set or change the LMA address of the named section. If = isused, the section address is set to val. Otherwise, valis added to or subtracted from the section address. See the commentsunder --change-addresses, above. If section does not existin the input file, a warning will be issued, unless--no-change-warnings is used.
--change-section-vma section{=,+,-}val
Set or change the VMA address of the named section. If = isused, the section address is set to val. Otherwise, valis added to or subtracted from the section address. See the commentsunder --change-addresses, above. If section does not existin the input file, a warning will be issued, unless--no-change-warnings is used.
--change-warnings, --adjust-warnings
If --change-section-XXX is used, and the named section doesnot exist, issue a warning. This is the default.
--no-change-warnings, --no-adjust-warnings
Do not issue a warning if --change-section-XXX is used, evenif the named section does not exist.
--set-section-flags section=flags
Set the flags for the named section. The flags argument is acomma separated string of flag names. The recognized names arealloc, contents, load, noload, readonly,code, data, rom, share, and debug. Notall flags are meaningful for all object file formats.
--add-section sectionname=filename
Add a new section named sectionname while copying the file. Thecontents of the new section are taken from the file filename.The size of the section will be the size of the file. This optiononly works on file formats which can support sections with arbitrarynames.
--change-leading-char
Some object file formats use special characters at the start ofsymbols. The most common such character is underscore, which compilersoften add before every symbol. This option tells objcopyto change the leading character of every symbol when it convertsbetween object file formats. If the object file formats use the sameleading character, this option has no effect. Otherwise, it will adda character, or remove a character, or change a character, asappropriate.
--remove-leading-char
If the first character of a global symbol is a special symbol leadingcharacter used by the object file format, remove the character. Themost common symbol leading character is underscore. This option willremove a leading underscore from all global symbols. This can beuseful if you want to link together objects of different file formatswith different conventions for symbol names. This is different from--change-leading-char because it always changes the symbol namewhen appropriate, regardless of the object file format of the output
--redefine-sym old=new
Change the name of symbol old to new. This can be usefulwhen one is trying link two things together for which you have nosource, and there are name collisions.
--weaken
Change all global symbols in the file to be weak.
-v, --verbose
Verbose output: list all object files modified. In the case ofarchives, "objcopy -V" lists all members of the archive.
-V, --version
Show the version number ofobjcopyand exit.
--help
Show a summary of the options toobjcopyand exit.
 

SEE ALSO

`binutils'entry in info; The GNU Binary Utilities, Roland H. Pesch (June 1993).

 

COPYING

Copyright (c) 1993, 94, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.

Permission is granted to make and distribute verbatim copies ofthis manual provided the copyright notice and this permission noticeare preserved on all copies.

Permission is granted to copy and distribute modified versions of thismanual under the conditions for verbatim copying, provided that theentire resulting derived work is distributed under the terms of apermission notice identical to this one.

Permission is granted to copy and distribute translations of thismanual into another language, under the above conditions for modifiedversions, except that this permission notice may be included intranslations approved by the Free Software Foundation instead of inthe original English.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
COPYING

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